text: In the centuries since his death, many stories arose about Albert as an alchemist and magician. "Much of the modern confusion results from the fact that later works, particularly the alchemical work known as the Secreta Alberti or the Experimenta Alberti, were falsely attributed to Albertus by their authors to increase the prestige of the text through association." On the subject of alchemy and chemistry, many treatises relating to alchemy have been attributed to him, though in his authentic writings he had little to say on the subject, and then mostly through commentary on Aristotle. For example, in his commentary, De mineralibus, he refers to the power of stones, but does not elaborate on what these powers might be. A wide range of Pseudo-Albertine works dealing with alchemy exist, though, showing the belief developed in the generations following Alberts death that he had mastered alchemy, one of the fundamental sciences of the Middle Ages. These include Metals and Materials; the Secrets of Chemistry; the Origin of Metals; the Origins of Compounds, and a Concordance which is a collection of Observations on the philosophers stone; and other alchemy-chemistry topics, collected under the name of Theatrum Chemicum. He is credited with the discovery of the element arsenic and experimented with photosensitive chemicals, including silver nitrate. He did believe that stones had occult properties, as he related in his work De mineralibus. However, there is scant evidence that he personally performed alchemical experiments.
  According to legend, Albert is said to have discovered the philosophers stone and passed it on to his pupil Thomas Aquinas, shortly before his death. Albert does not confirm he discovered the stone in his writings, but he did record that he witnessed the creation of gold by "transmutation." Given that Thomas Aquinas died six years before Alberts death, this legend as stated is unlikely.